Can you enlarge please what's on the collar and the buckle eventually?
"Wir sollen auch unser Leben für die Brüder lassen" (1.Joh.3.16):
zum Gedächtnis Wilhelm Schenk. Er starb fürs Vaterland am 13. Juni 1916
I don't think it is a German uniform maybe Swiss?.
may be spanish :
- the helmet looks like the spanish model
- the insigne of the collar looks like the insigne of the spanish " phalange "
Gumperda Landschulheim Thuringia( a boarding school for boys in Gumperda, Germany). Photo shows one of the students circa 1942.